Wow, Diend isn't even in the show yet. That is quite the nice shade of blue, though.

Also I think the card should be Para-DX instead of Brave but whatever (I'll just consider the standard to be literally the second rider rather than the 'secondary' rider), they're all still cool additions.

This is definitely nice and I'd have to say one of the better P-Bandai exclusives. Kind of a bummer that they put all of the Final Kamen Rider Cards in this release instead of with the Neo Decadriver, but considering that thing is already crammed to the brim with cards, I'll let it slide.

Now would be the best time to dust off that prototype and actually release the figure, wouldn’t it?

I don't know enough about a Rider show's development cycle for this to be more than a wild guess, but I'm wondering if, once it was decided that Decade and DiEnd was going to appear in Zi-O, Bandai decided to hold off releasing him until after he'd appeared in the show and they could gauge consumer interest.

Wouldn't surprise me if he came with both versions of the DiEnd Driver.